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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Feb. 15, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]              
Dividends payable $ 112     $ 112     $ 0
Payments of Dividends       338 $ 423    
The Dow Chemical Company [Member]              
Related Party Transaction [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party 247   $ 407 $ 861 1,219    
Service Fee with Parent       10.00%      
Notes Receivable, Related Parties 1,500     $ 1,500     1,300
Line of Credit Facility, Maximum Borrowing Capacity 1,000     1,000      
Line of Credit Facility, Remaining Borrowing Capacity 936     936     $ 949
Dividends payable 112     112      
Payments of Dividends     177 338 423    
Dividends, Paid-in-kind   $ 71          
The Dow Chemical Company [Member] | Sundry income (expense) [Member]              
Related Party Transaction [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party 6   8 18 22    
The Dow Chemical Company [Member] | Cost of Sales [Member]              
Related Party Transaction [Line Items]              
Related Party Transaction, Expenses from Transactions with Related Party $ 21   $ 23 $ 65 $ 67    
Dow International Holdings Company [Member]              
Related Party Transaction [Line Items]              
Stock Dividend Ownership Interest Percentage, Related Company           63.40%  
The Dow Chemical Company [Member] | Dow International Holdings Company [Member]              
Related Party Transaction [Line Items]              
Dividends, Common Stock, Stock   $ 401